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Red is power to from ignition to cd deckYellow is direct power from battery to cd deck to hold the memory.Black is groundBlue is only needed if you are hooking up an amplifier.I always suggest buying a wire harness quick connect system for $5, then you won't have to cut origional car wiring. If by chance you are taking the original wire route, then go to installer.com to find which wires on the car are for what.